Had an 06 LBZ Duramax before getting a 2011 6.2 SD and although I loved it... the mileage and the low end tq it made, I don't miss it one bit.

I don't miss 2.5 gallon oil changes every 5k, fuel filters, aux fuel filters, EGR valves that stick, fuel that runs .50/gal more than regular, $750 turbo vane position sensors and on and on.

I just got a 2013 6.2 and like the truck better than the 11 I had. Now it seems like you buy the diesel for raw power only because they don't have the huge mpg advantage that they did 4-5 years ago and they're more expensive to maintain than before.